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Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-28803

Open Forms allows users create and publish smart forms. Prior to 3.3.13 and 3.4.5, to be able to cosign, the cosigner receives an e-mail with instructions or a deep-link to start the cosign flow. The submission reference is communicated so that the user can retrieve the submission to be cosigned. Attackers can guess a code or modify the received code to look up arbitrary submissions, after logging in (with DigiD/eHerkenning/... depending on form configuration). This vulnerability is fixed in 3.3.13 and 3.4.5.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 8.7%

CVSS Severity

CVSS v3 Score 6.5

References

https://github.com/open-formulieren/open-forms/security/advisories/GHSA-2g49-rfm6-5qj5

Products affected by CVE-2026-28803

Maykinmedia » Open Forms » Version: 1.0.0

cpe:2.3:a:maykinmedia:open_forms:1.0.0
Maykinmedia » Open Forms » Version: 1.0.1

cpe:2.3:a:maykinmedia:open_forms:1.0.1
Maykinmedia » Open Forms » Version: 1.0.11

cpe:2.3:a:maykinmedia:open_forms:1.0.11
Maykinmedia » Open Forms » Version: 1.0.12

cpe:2.3:a:maykinmedia:open_forms:1.0.12
Maykinmedia » Open Forms » Version: 1.0.13

cpe:2.3:a:maykinmedia:open_forms:1.0.13
Maykinmedia » Open Forms » Version: 1.0.14

cpe:2.3:a:maykinmedia:open_forms:1.0.14
Maykinmedia » Open Forms » Version: 1.0.2

cpe:2.3:a:maykinmedia:open_forms:1.0.2
Maykinmedia » Open Forms » Version: 1.0.3

cpe:2.3:a:maykinmedia:open_forms:1.0.3
Maykinmedia » Open Forms » Version: 1.0.4

cpe:2.3:a:maykinmedia:open_forms:1.0.4
Maykinmedia » Open Forms » Version: 1.0.5

cpe:2.3:a:maykinmedia:open_forms:1.0.5
Maykinmedia » Open Forms » Version: 1.0.6

cpe:2.3:a:maykinmedia:open_forms:1.0.6
Maykinmedia » Open Forms » Version: 1.0.7

cpe:2.3:a:maykinmedia:open_forms:1.0.7
Maykinmedia » Open Forms » Version: 1.0.8

cpe:2.3:a:maykinmedia:open_forms:1.0.8
Maykinmedia » Open Forms » Version: 1.0.9

cpe:2.3:a:maykinmedia:open_forms:1.0.9
Maykinmedia » Open Forms » Version: 1.1.0

cpe:2.3:a:maykinmedia:open_forms:1.1.0
Maykinmedia » Open Forms » Version: 1.1.1

cpe:2.3:a:maykinmedia:open_forms:1.1.1
Maykinmedia » Open Forms » Version: 1.1.10

cpe:2.3:a:maykinmedia:open_forms:1.1.10
Maykinmedia » Open Forms » Version: 1.1.11

cpe:2.3:a:maykinmedia:open_forms:1.1.11
Maykinmedia » Open Forms » Version: 1.1.2

cpe:2.3:a:maykinmedia:open_forms:1.1.2
Maykinmedia » Open Forms » Version: 1.1.3

cpe:2.3:a:maykinmedia:open_forms:1.1.3
Maykinmedia » Open Forms » Version: 1.1.4

cpe:2.3:a:maykinmedia:open_forms:1.1.4
Maykinmedia » Open Forms » Version: 1.1.5

cpe:2.3:a:maykinmedia:open_forms:1.1.5
Maykinmedia » Open Forms » Version: 1.1.6

cpe:2.3:a:maykinmedia:open_forms:1.1.6
Maykinmedia » Open Forms » Version: 1.1.7

cpe:2.3:a:maykinmedia:open_forms:1.1.7
Maykinmedia » Open Forms » Version: 1.1.8

cpe:2.3:a:maykinmedia:open_forms:1.1.8
Maykinmedia » Open Forms » Version: 1.1.9

cpe:2.3:a:maykinmedia:open_forms:1.1.9
Maykinmedia » Open Forms » Version: 1.10

cpe:2.3:a:maykinmedia:open_forms:1.10
Maykinmedia » Open Forms » Version: 1.5.0

cpe:2.3:a:maykinmedia:open_forms:1.5.0
Maykinmedia » Open Forms » Version: 2.0.0

cpe:2.3:a:maykinmedia:open_forms:2.0.0
Maykinmedia » Open Forms » Version: 2.0.1

cpe:2.3:a:maykinmedia:open_forms:2.0.1
Maykinmedia » Open Forms » Version: 2.0.10

cpe:2.3:a:maykinmedia:open_forms:2.0.10
Maykinmedia » Open Forms » Version: 2.0.11

cpe:2.3:a:maykinmedia:open_forms:2.0.11
Maykinmedia » Open Forms » Version: 2.0.2

cpe:2.3:a:maykinmedia:open_forms:2.0.2
Maykinmedia » Open Forms » Version: 2.0.3

cpe:2.3:a:maykinmedia:open_forms:2.0.3
Maykinmedia » Open Forms » Version: 2.0.4

cpe:2.3:a:maykinmedia:open_forms:2.0.4
Maykinmedia » Open Forms » Version: 2.0.5

cpe:2.3:a:maykinmedia:open_forms:2.0.5
Maykinmedia » Open Forms » Version: 2.0.6

cpe:2.3:a:maykinmedia:open_forms:2.0.6
Maykinmedia » Open Forms » Version: 2.0.7

cpe:2.3:a:maykinmedia:open_forms:2.0.7
Maykinmedia » Open Forms » Version: 2.0.8

cpe:2.3:a:maykinmedia:open_forms:2.0.8
Maykinmedia » Open Forms » Version: 2.0.9

cpe:2.3:a:maykinmedia:open_forms:2.0.9
Maykinmedia » Open Forms » Version: 2.1.0

cpe:2.3:a:maykinmedia:open_forms:2.1.0
Maykinmedia » Open Forms » Version: 2.1.1

cpe:2.3:a:maykinmedia:open_forms:2.1.1
Maykinmedia » Open Forms » Version: 2.1.10

cpe:2.3:a:maykinmedia:open_forms:2.1.10
Maykinmedia » Open Forms » Version: 2.1.11

cpe:2.3:a:maykinmedia:open_forms:2.1.11
Maykinmedia » Open Forms » Version: 2.1.2

cpe:2.3:a:maykinmedia:open_forms:2.1.2
Maykinmedia » Open Forms » Version: 2.1.3

cpe:2.3:a:maykinmedia:open_forms:2.1.3
Maykinmedia » Open Forms » Version: 2.1.4

cpe:2.3:a:maykinmedia:open_forms:2.1.4
Maykinmedia » Open Forms » Version: 2.1.5

cpe:2.3:a:maykinmedia:open_forms:2.1.5
Maykinmedia » Open Forms » Version: 2.1.6

cpe:2.3:a:maykinmedia:open_forms:2.1.6
Maykinmedia » Open Forms » Version: 2.1.7

cpe:2.3:a:maykinmedia:open_forms:2.1.7
Maykinmedia » Open Forms » Version: 2.1.8

cpe:2.3:a:maykinmedia:open_forms:2.1.8
Maykinmedia » Open Forms » Version: 2.1.9

cpe:2.3:a:maykinmedia:open_forms:2.1.9
Maykinmedia » Open Forms » Version: 2.2.0

cpe:2.3:a:maykinmedia:open_forms:2.2.0
Maykinmedia » Open Forms » Version: 2.2.1

cpe:2.3:a:maykinmedia:open_forms:2.2.1
Maykinmedia » Open Forms » Version: 2.2.10

cpe:2.3:a:maykinmedia:open_forms:2.2.10
Maykinmedia » Open Forms » Version: 2.2.2

cpe:2.3:a:maykinmedia:open_forms:2.2.2
Maykinmedia » Open Forms » Version: 2.2.3

cpe:2.3:a:maykinmedia:open_forms:2.2.3
Maykinmedia » Open Forms » Version: 2.2.4

cpe:2.3:a:maykinmedia:open_forms:2.2.4
Maykinmedia » Open Forms » Version: 2.2.5

cpe:2.3:a:maykinmedia:open_forms:2.2.5
Maykinmedia » Open Forms » Version: 2.2.6

cpe:2.3:a:maykinmedia:open_forms:2.2.6
Maykinmedia » Open Forms » Version: 2.2.7

cpe:2.3:a:maykinmedia:open_forms:2.2.7
Maykinmedia » Open Forms » Version: 2.2.8

cpe:2.3:a:maykinmedia:open_forms:2.2.8
Maykinmedia » Open Forms » Version: 2.2.9

cpe:2.3:a:maykinmedia:open_forms:2.2.9
Maykinmedia » Open Forms » Version: 2.3.0

cpe:2.3:a:maykinmedia:open_forms:2.3.0
Maykinmedia » Open Forms » Version: 2.3.1

cpe:2.3:a:maykinmedia:open_forms:2.3.1
Maykinmedia » Open Forms » Version: 2.3.2

cpe:2.3:a:maykinmedia:open_forms:2.3.2
Maykinmedia » Open Forms » Version: 2.3.3

cpe:2.3:a:maykinmedia:open_forms:2.3.3
Maykinmedia » Open Forms » Version: 2.3.4

cpe:2.3:a:maykinmedia:open_forms:2.3.4
Maykinmedia » Open Forms » Version: 2.3.5

cpe:2.3:a:maykinmedia:open_forms:2.3.5
Maykinmedia » Open Forms » Version: 2.3.6

cpe:2.3:a:maykinmedia:open_forms:2.3.6
Maykinmedia » Open Forms » Version: 2.3.7

cpe:2.3:a:maykinmedia:open_forms:2.3.7
Maykinmedia » Open Forms » Version: 2.4.0

cpe:2.3:a:maykinmedia:open_forms:2.4.0
Maykinmedia » Open Forms » Version: 2.4.1

cpe:2.3:a:maykinmedia:open_forms:2.4.1
Maykinmedia » Open Forms » Version: 2.4.2

cpe:2.3:a:maykinmedia:open_forms:2.4.2
Maykinmedia » Open Forms » Version: 2.4.3

cpe:2.3:a:maykinmedia:open_forms:2.4.3
Maykinmedia » Open Forms » Version: 2.4.4

cpe:2.3:a:maykinmedia:open_forms:2.4.4
Maykinmedia » Open Forms » Version: 2.4.5

cpe:2.3:a:maykinmedia:open_forms:2.4.5
Maykinmedia » Open Forms » Version: 2.5.0

cpe:2.3:a:maykinmedia:open_forms:2.5.0
Maykinmedia » Open Forms » Version: 2.5.1

cpe:2.3:a:maykinmedia:open_forms:2.5.1
Maykinmedia » Open Forms » Version: 2.5.2

cpe:2.3:a:maykinmedia:open_forms:2.5.2
Maykinmedia » Open Forms » Version: 2.6.0

cpe:2.3:a:maykinmedia:open_forms:2.6.0
Maykinmedia » Open Forms » Version: 2.6.1

cpe:2.3:a:maykinmedia:open_forms:2.6.1
Maykinmedia » Open Forms » Version: 2.6.10

cpe:2.3:a:maykinmedia:open_forms:2.6.10
Maykinmedia » Open Forms » Version: 2.6.11

cpe:2.3:a:maykinmedia:open_forms:2.6.11
Maykinmedia » Open Forms » Version: 2.6.12

cpe:2.3:a:maykinmedia:open_forms:2.6.12
Maykinmedia » Open Forms » Version: 2.6.13

cpe:2.3:a:maykinmedia:open_forms:2.6.13
Maykinmedia » Open Forms » Version: 2.6.14

cpe:2.3:a:maykinmedia:open_forms:2.6.14
Maykinmedia » Open Forms » Version: 2.6.15

cpe:2.3:a:maykinmedia:open_forms:2.6.15
Maykinmedia » Open Forms » Version: 2.6.2

cpe:2.3:a:maykinmedia:open_forms:2.6.2
Maykinmedia » Open Forms » Version: 2.6.3

cpe:2.3:a:maykinmedia:open_forms:2.6.3
Maykinmedia » Open Forms » Version: 2.6.4

cpe:2.3:a:maykinmedia:open_forms:2.6.4
Maykinmedia » Open Forms » Version: 2.6.5

cpe:2.3:a:maykinmedia:open_forms:2.6.5
Maykinmedia » Open Forms » Version: 2.6.6

cpe:2.3:a:maykinmedia:open_forms:2.6.6
Maykinmedia » Open Forms » Version: 2.6.7

cpe:2.3:a:maykinmedia:open_forms:2.6.7
Maykinmedia » Open Forms » Version: 2.6.8

cpe:2.3:a:maykinmedia:open_forms:2.6.8
Maykinmedia » Open Forms » Version: 2.6.9

cpe:2.3:a:maykinmedia:open_forms:2.6.9
Maykinmedia » Open Forms » Version: 2.7.0

cpe:2.3:a:maykinmedia:open_forms:2.7.0
Maykinmedia » Open Forms » Version: 2.7.1

cpe:2.3:a:maykinmedia:open_forms:2.7.1
Maykinmedia » Open Forms » Version: 2.7.10

cpe:2.3:a:maykinmedia:open_forms:2.7.10
Maykinmedia » Open Forms » Version: 2.7.11

cpe:2.3:a:maykinmedia:open_forms:2.7.11
Maykinmedia » Open Forms » Version: 2.7.2

cpe:2.3:a:maykinmedia:open_forms:2.7.2
Maykinmedia » Open Forms » Version: 2.7.3

cpe:2.3:a:maykinmedia:open_forms:2.7.3
Maykinmedia » Open Forms » Version: 2.7.4

cpe:2.3:a:maykinmedia:open_forms:2.7.4
Maykinmedia » Open Forms » Version: 2.7.5

cpe:2.3:a:maykinmedia:open_forms:2.7.5
Maykinmedia » Open Forms » Version: 2.7.6

cpe:2.3:a:maykinmedia:open_forms:2.7.6
Maykinmedia » Open Forms » Version: 2.7.7

cpe:2.3:a:maykinmedia:open_forms:2.7.7
Maykinmedia » Open Forms » Version: 2.7.8

cpe:2.3:a:maykinmedia:open_forms:2.7.8
Maykinmedia » Open Forms » Version: 2.7.9

cpe:2.3:a:maykinmedia:open_forms:2.7.9
Maykinmedia » Open Forms » Version: 2.8.0

cpe:2.3:a:maykinmedia:open_forms:2.8.0
Maykinmedia » Open Forms » Version: 2.8.1

cpe:2.3:a:maykinmedia:open_forms:2.8.1
Maykinmedia » Open Forms » Version: 2.8.2

cpe:2.3:a:maykinmedia:open_forms:2.8.2
Maykinmedia » Open Forms » Version: 2.8.3

cpe:2.3:a:maykinmedia:open_forms:2.8.3
Maykinmedia » Open Forms » Version: 2.8.4

cpe:2.3:a:maykinmedia:open_forms:2.8.4
Maykinmedia » Open Forms » Version: 2.8.5

cpe:2.3:a:maykinmedia:open_forms:2.8.5
Maykinmedia » Open Forms » Version: 2.8.6

cpe:2.3:a:maykinmedia:open_forms:2.8.6
Maykinmedia » Open Forms » Version: 2.8.7

cpe:2.3:a:maykinmedia:open_forms:2.8.7
Maykinmedia » Open Forms » Version: 2.8.8

cpe:2.3:a:maykinmedia:open_forms:2.8.8
Maykinmedia » Open Forms » Version: 2.8.9

cpe:2.3:a:maykinmedia:open_forms:2.8.9
Maykinmedia » Open Forms » Version: 3.0.0

cpe:2.3:a:maykinmedia:open_forms:3.0.0
Maykinmedia » Open Forms » Version: 3.0.1

cpe:2.3:a:maykinmedia:open_forms:3.0.1
Maykinmedia » Open Forms » Version: 3.0.2

cpe:2.3:a:maykinmedia:open_forms:3.0.2
Maykinmedia » Open Forms » Version: 3.0.3

cpe:2.3:a:maykinmedia:open_forms:3.0.3
Maykinmedia » Open Forms » Version: 3.0.4

cpe:2.3:a:maykinmedia:open_forms:3.0.4
Maykinmedia » Open Forms » Version: 3.0.5

cpe:2.3:a:maykinmedia:open_forms:3.0.5
Maykinmedia » Open Forms » Version: 3.0.6

cpe:2.3:a:maykinmedia:open_forms:3.0.6
Maykinmedia » Open Forms » Version: 3.0.7

cpe:2.3:a:maykinmedia:open_forms:3.0.7
Maykinmedia » Open Forms » Version: 3.0.8

cpe:2.3:a:maykinmedia:open_forms:3.0.8
Maykinmedia » Open Forms » Version: 3.0.9

cpe:2.3:a:maykinmedia:open_forms:3.0.9
Maykinmedia » Open Forms » Version: 3.1.0

cpe:2.3:a:maykinmedia:open_forms:3.1.0
Maykinmedia » Open Forms » Version: 3.1.1

cpe:2.3:a:maykinmedia:open_forms:3.1.1
Maykinmedia » Open Forms » Version: 3.1.2

cpe:2.3:a:maykinmedia:open_forms:3.1.2
Maykinmedia » Open Forms » Version: 3.1.3

cpe:2.3:a:maykinmedia:open_forms:3.1.3
Maykinmedia » Open Forms » Version: 3.1.4

cpe:2.3:a:maykinmedia:open_forms:3.1.4
Maykinmedia » Open Forms » Version: 3.1.5

cpe:2.3:a:maykinmedia:open_forms:3.1.5
Maykinmedia » Open Forms » Version: 3.1.6

cpe:2.3:a:maykinmedia:open_forms:3.1.6
Maykinmedia » Open Forms » Version: 3.1.7

cpe:2.3:a:maykinmedia:open_forms:3.1.7
Maykinmedia » Open Forms » Version: 3.1.8

cpe:2.3:a:maykinmedia:open_forms:3.1.8
Maykinmedia » Open Forms » Version: 3.1.9

cpe:2.3:a:maykinmedia:open_forms:3.1.9
Maykinmedia » Open Forms » Version: 3.2.0

cpe:2.3:a:maykinmedia:open_forms:3.2.0
Maykinmedia » Open Forms » Version: 3.2.1

cpe:2.3:a:maykinmedia:open_forms:3.2.1
Maykinmedia » Open Forms » Version: 3.2.2

cpe:2.3:a:maykinmedia:open_forms:3.2.2
Maykinmedia » Open Forms » Version: 3.2.3

cpe:2.3:a:maykinmedia:open_forms:3.2.3
Maykinmedia » Open Forms » Version: 3.2.4

cpe:2.3:a:maykinmedia:open_forms:3.2.4
Maykinmedia » Open Forms » Version: 3.2.5

cpe:2.3:a:maykinmedia:open_forms:3.2.5
Maykinmedia » Open Forms » Version: 3.2.6

cpe:2.3:a:maykinmedia:open_forms:3.2.6
Maykinmedia » Open Forms » Version: 3.2.7

cpe:2.3:a:maykinmedia:open_forms:3.2.7
Maykinmedia » Open Forms » Version: 3.2.8

cpe:2.3:a:maykinmedia:open_forms:3.2.8
Maykinmedia » Open Forms » Version: 3.3.0

cpe:2.3:a:maykinmedia:open_forms:3.3.0
Maykinmedia » Open Forms » Version: 3.3.1

cpe:2.3:a:maykinmedia:open_forms:3.3.1
Maykinmedia » Open Forms » Version: 3.3.2

cpe:2.3:a:maykinmedia:open_forms:3.3.2
Maykinmedia » Open Forms » Version: 3.3.3

cpe:2.3:a:maykinmedia:open_forms:3.3.3
Maykinmedia » Open Forms » Version: 3.3.4

cpe:2.3:a:maykinmedia:open_forms:3.3.4
Maykinmedia » Open Forms » Version: 3.3.5

cpe:2.3:a:maykinmedia:open_forms:3.3.5
Maykinmedia » Open Forms » Version: 3.3.6

cpe:2.3:a:maykinmedia:open_forms:3.3.6
Maykinmedia » Open Forms » Version: 3.4.0

cpe:2.3:a:maykinmedia:open_forms:3.4.0

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Vulnerability Details CVE-2026-28803

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