GHSA-pjx8-984p-7p3x
FOSUserBundle Entropy is lost in the TokenGenerator
GHSA-pjx8-984p-7p3x is a vulnerability with no CVSS score yet in friendsofsymfony/user-bundle, published May 15, 2024. No source lists public exploit code. Fixed in friendsofsymfony/user-bundle 1.3.5.
- Severity
- UnratedNo CVSS score yet
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
1.3.5friendsofsymfony/user-bundle +1 more
Description
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-]+.
Affected packages
| Package | Affected | Fixed |
|---|---|---|
friendsofsymfony/user-bundlePackagist | 1.0.0 up to 1.3.5 | 1.3.5 |
friendsofsymfony/user-bundlePackagist | 1.0.0 up to 1.3.5, plus listed versions 1.1.01.2.0v1.2.1v1.2.2v1.2.3 Show 7 moreShow lessv1.2.4v1.2.5v1.3.0v1.3.1v1.3.2v1.3.3v1.3.4 | 1.3.5 |
What each source reports
GitHub AdvisoriesNo score
FOSUserBundle Entropy is lost in the TokenGenerator
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-]+.
- Record
GHSA-pjx8-984p-7p3x- Weakness
- CWE-331
- Updated
- 2026-11-02
OSVNo score
FOSUserBundle Entropy is lost in the TokenGenerator
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-]+.
- Record
GHSA-pjx8-984p-7p3x- Weakness
- CWE-331
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
github.com/FriendsOfSymfony/FOSUserBundle/commit/b3ebfea52065e9727508f5f8e6c9f7459a1b06d8
symfony.com/blog/fosuserbundle-entropy-of-generated-tokens-is-lost