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Vulnerabilities

Security incident · CVE-2026-117537

REDAXO has reflected XSS in backend Metainfo API via type parameter (CSRF token required)

Published Apr 10, 2026 · catalog updated Oct 28, 2026 · REDAXO has reflected XSS

Last checked Oct 28, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-117537. EPSS is 0.18%. Act only if a listed version of REDAXO has reflected XSS is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (REDAXO has reflected XSS).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Advisory link
Affected products
Packagist redaxo/source

### Summary A **reflected XSS** vulnerability has been identified in the REDAXO backend. The parameter is concatenated into an API error message and rendered without HTML escaping. --- ### Details **Root cause** User input is injected into an exception message, then rendered by which delegates to without HTML escaping. **Vulnerable code ( ) :** **Sink ( ) :** **Data flow source -> sink** - Source : (GET) - Propagation : concatenated into the exception message - Sink : rendered via -> without escaping **Authentication required :** yes (backend session) --- ### PoC - exploit The script uses only the provided PHPSESSID, retrieves the CSRF token from the metainfo page, and prints a ready-to-use exploit link. --- ### Impact - **Confidentiality :** Low : no direct session theft (HttpOnly cookies), but possibility to access/exfiltrate data available via the DOM or via same-origin requests if the XSS executes in a victim’s session. - **Integrity :** Low : possibility to chain backend actions on behalf of the user (same-origin requests) only if execution takes place in a victim session; otherwise the impact is limited to the user who triggers the call. - **Availability :** Low : the XSS could disrupt the administration interface or trigger unwanted actions, but the token requirement strongly limits realistic scenarios. ### Video https://github.com/user-attachments/assets/251f548c-3f68-483b-a012-b8fc28493a83

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Packagist redaxo/source0 → 5.21.0

How to fix CVE-2026-117537

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-117537. EPSS is 0.18%. Act only if a listed version of REDAXO has reflected XSS is installed.

Which versions are affected?

Compare what you have installed with 0 → 5.21.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 10, 2026 · GitHub Advisory Database

    Detected

    ### Summary A **reflected XSS** vulnerability has been identified in the REDAXO backend. The parameter is concatenated into an API error message and rendered without HTML escaping. --- ### Details **Root cause** User input is injected into an exception message, then rendered by which delegates to without HTML escaping. **Vulnerable code ( ) :** **Sink ( ) :** **Data flow source -> sink** - Source

  2. Oct 28, 2026 · GitHub Advisory Database

    Fix available

    redaxo/source fixed in 5.21.0

  3. Oct 28, 2026 · GitHub Advisory Database

    Fix available

    redaxo/source fixed in 5.21.0

  4. Oct 28, 2026 · GitHub Advisory Database

    Updated

    ### Summary A **reflected XSS** vulnerability has been identified in the REDAXO backend. The parameter is concatenated into an API error message and rendered without HTML escaping. --- ### Details **Root cause** User input is injected into an exception message, then rendered by which delegates to without HTML escaping. **Vulnerable code ( ) :** **Sink ( ) :** **Data flow source -> sink** - Source

Sources

References

Freshness

Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 28, 2026
  • FIRST EPSSOct 28, 2026
  • GitHub Advisory DatabaseOct 28, 2026
  • OpenSSF OSV / OSV ScannerOct 28, 2026