CVE-2024-24771: open-forms · Improper Access Control
Affects open-formsSource CVE Database V5
Not known to be exploited · CVSS 7.7 High : upgrade to 2.2.9 soon.
Data as of 26 Oct 2026, 08:30 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.2.9
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 7 Feb 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade open-formulieren/open-forms to 2.2.9.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubopen-formulieren/open-formspkg:github/open-formulieren/open-formsOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
European organizations should immediately verify their Open Forms version and upgrade to versions 2.2.9, 2.3.7, 2.4.5, or 2.5.2 or later, where the vulnerability is patched. Ensure that `settings.DEBUG` is never enabled in production environments to prevent exposure of the API authentication endpoints. Implement strict access controls and monitoring on superuser accounts, including enforcing strong password policies and continuous credential hygiene to prevent compromise. Employ additional layers of security such as network segmentation and anomaly detection to identify unusual access patterns indicative of account hijacking. Regularly audit user permissions and review logs for unauthorized access attempts. Consider integrating external MFA solutions that are independent of the vulnerable Open Forms MFA implementation to add defense in depth. Finally, educate administrators about the risks of credential compromise and the importance of applying security patches promptly.
Description
Open Forms allows users create and publish smart forms. Versions prior to 2.2.9, 2.3.7, 2.4.5, and 2.5.2 contain a non-exploitable multi-factor authentication weakness. Superusers who have their credentials (username + password) compromised could potentially have the second-factor authentication bypassed if an attacker somehow managed to authenticate to Open Forms. The maintainers of Open Forms do not believe it is or has been possible to perform this login. However, if this were possible, the victim's account may be abused to view (potentially sensitive) submission data or have been used to impersonate other staff accounts to view and/or modify data. Three mitigating factors to help prevent exploitation include: the usual login page (at `/admin/login/`) does not fully log in the user until the second factor was succesfully provided; the additional non-MFA protected login page at `/api/v2/api-authlogin/` was misconfigured and could not be used to log in; and there are no additional ways to log in. This also requires credentials of a superuser to be compromised to be exploitable. Versions 2.2.9, 2.3.7, 2.4.5, and 2.5.2 contain the following patches to address these weaknesses: Move and only enable the API auth endpoints (`/api/v2/api-auth/login/`) with `settings.DEBUG = True`. `settings.DEBUG = True` is insecure and should never be applied in production settings. Additionally, apply a custom permission check to the hijack flow to only allow second-factor-verified superusers to perform user hijacking.
References
- github.com/open-formulieren/open-forms/security/advisories/GHSA-64r3-x3gf-vp63 (opens in a new tab)
- github.com/open-formulieren/open-forms/releases/tag/2.2.9 (opens in a new tab)
- github.com/open-formulieren/open-forms/releases/tag/2.3.7 (opens in a new tab)
- github.com/open-formulieren/open-forms/releases/tag/2.4.5 (opens in a new tab)
- github.com/open-formulieren/open-forms/releases/tag/2.5.2 (opens in a new tab)