Information disclosure of source code in SimpleSAMLphp

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

3.0 · CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N

EPSS

• CVE-2020-5301: 0.92% estimated exploitation activity in the next 30 days; percentile 60.37 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Background The module controller in SimpleSAML\Module that processes requests for pages hosted by modules, has code to identify paths ending with .php and process those as PHP code. If no other suitable way of handling the given path exists it presents the file to the browser. Description The check to identify paths ending with .php does not account for uppercase letters. If someone requests a path ending with e.g. .PHP and the server is serving the code from a case-insensitive file system, such as on Windows, the processing of the PHP code does not occur, and the source code is instead presented to the browser. Affected versions SimpleSAMLphp versions 1.18.5 and older. Impact An attacker may use this issue to gain access to the source code in third-party modules that is meant to be private, or even sensitive. However, the attack surface is considered small, as the attack will only work when SimpleSAMLphp serves such content from a file system that is not case-sensitive, such as on…

Published by the source

22 Apr 2020, 20:59 UTC

Last modified by the source

6 Feb 2024, 13:27 UTC

Source last checked

26 Oct 2026, 14:15 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-24m3-w8g9-jwpq

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# Patch Next advisory brief: CVE-2020-5301

Advisory: Information disclosure of source code in SimpleSAMLphp
IDs: CVE-2020-5301, GHSA-24m3-w8g9-jwpq
Record: https://patchnext.com/advisories/cve-2020-5301 (revision 1, source checked 26 Oct 2026, 14:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: simplesamlphp/simplesamlphp 1.18.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist simplesamlphp/simplesamlphp: affected < 1.18.6; fixed in 1.18.6

## Suggested inspection (read-only)
- Packagist simplesamlphp/simplesamlphp: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on simplesamlphp/simplesamlphp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-24m3-w8g9-jwpq (GitHub-reviewed advisory GHSA-24m3-w8g9-jwpq lists affected ranges: Packagist simplesamlphp/simplesamlphp >=0 <1.18.6)

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