FOSUserBundle Entropy is lost in the TokenGenerator
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### Description Because of the usage of base_convert which looses precision for large inputs, the entropy of tokens generated by FOSUserBundle for the email confirmation and password resetting is lost. This makes these tokens much less random than they are expected to be, and so not cryptographically safe. ### Resolution The token generation logic used in the 2.0.x branch based on base64 encoding has been backported. This changes the range of characters used in the token. Any route placeholder expected to match a token generated by FOSUserBundle must be updated to allow dashes, which are not allowed by \w in regexes. A \w+ requirement should so become [\w\-]+.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | friendsofsymfony/user-bundle (Packagist) | 1.0.0 to before 1.3.5 | 1.3.5 | Patch available | GHSA-pjx8-984p-7p3x |
- friendsofsymfony/user-bundle (Packagist) Vendor— Affected 1.0.0 to before 1.3.5 Fixed in 1.3.5 Patch available GHSA-pjx8-984p-7p3x
Remediation
- Fix · GHSA-pjx8-984p-7p3x friendsofsymfony/user-bundle (Packagist) Fixed in 1.3.5 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-pjx8-984p-7p3x
References
Other 4
- https://github.com/FriendsOfSymfony/FOSUserBundle/commit/b3ebfea52065e9727508f5f8e6c9f7459a1b06d8
- https://github.com/FriendsOfPHP/security-advisories/blob/master/friendsofsymfony/user-bundle/2014-09-04-1.yaml
- https://github.com/FriendsOfSymfony/FOSUserBundle
- https://symfony.com/blog/fosuserbundle-entropy-of-generated-tokens-is-lost
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences