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VulnerabilityPublished

CVE-2026-50157: auth0 symfony · Use of GET Request Method With Sensitive Query Strings

Affects auth0 symfonySource CVE Database V5

0
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Not known to be exploited · CVSS 6.5 Medium : upgrade to 5.9.0 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.9.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 30 Oct 2026.

What to do

Upgrade symfony and auth0/symfony to 5.9.0.

Affected software

ProductAffectedFixed in
auth0symfonyAffected
  • >=5.0.0-BETA0 <5.9.0
Fixed in
  • 5.9.0
GitHubauth0/symfonypkg:github/auth0/symfonyOther threatsAffected
  • >=5.0.0-beta0 <5.9.0
Fixed in
  • 5.9.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Auth0 Symfony to version 5.9.0 or later, where this issue is fixed. Avoid using OAuth 2.0 bearer tokens in URL query parameters and instead use the Authorization header for token transmission. There is no indication that temporary mitigations or workarounds are provided by the vendor.

Description

Auth0 Symfony is a Symfony SDK for Auth0 Authentication and Management APIs. From 5.0.0-BETA0 until 5.9.0, the Authorizer::authenticate() and Authorizer::supports() paths in the Authorizer security authenticator may accept OAuth 2.0 bearer access tokens from the token URL query parameter as well as the Authorization header for protected HTTP routes. Query-string tokens can be recorded in server logs, browser history, or referrer data and then replayed against protected API endpoints. This issue is fixed in version 5.9.0.

References

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