CVE-2026-34161

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 88% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, a Stored Cross-Site Scripting (XSS) vulnerability exists in the social post attachment upload functionality, where an authenticated user can upload a malicious HTML file containing JavaScript via the /api/social_post_attachments endpoint. The uploaded file is served back from the application at the generated contentUrl without sanitization, content type restrictions, or a Content-Disposition: attachment header, causing the JavaScript to execute in the browser within the application's origin. Because the payload is stored server-side and runs in the trusted origin, an attacker can perform session hijacking, account takeover, privilege escalation (if an admin views the link), and arbitrary actions on behalf of the victim. This issue has been fixed in version 2.0.0-RC.3.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

April 14, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Jul 26, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Stored XSS via Malicious File Upload in Social Post Attachments Leading to Arbitrary JavaScript Execution (<=2.0-RC.2) · Advisory · chamilo/chamilo-lms · GitHub

https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-273p-jw9w-3g22
github_release Patch Available

v2.0.0 RC 3

Patch available: chamilo/chamilo-lms v2.0.0-RC.3 (pre-release)

https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3
github_commit

commit da671d66a146 (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit da671d66a146 — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/da671d66a146887be3a16eabc5dcf0a92c55f7da
github_commit

commit 7c4965e48769 (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit 7c4965e48769 — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/7c4965e48769d1d06413836429e386816a465c7f

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 107 total refreshes for this CVE.

  1. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 08:35 UTCEG score recompute
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  11. 2026-07-23 03:09 UTCEG score recompute
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  15. 2026-07-20 10:04 UTCOSV refresh
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  1. 2026-07-12 05:46 UTCEPSS rescore
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  75. 2026-05-26 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-34161?
CVE-2026-34161 is a medium vulnerability published on April 14, 2026. Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, a Stored Cross-Site Scripting (XSS) vulnerability exists in the social post attachment upload functionality, where an authenticated user can upload a malicious HTML file containing JavaScript via the…
When was CVE-2026-34161 disclosed?
CVE-2026-34161 was first published in the National Vulnerability Database on April 14, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34161 actively exploited?
CVE-2026-34161 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.5% of all scored CVEs.
What is the CVSS score of CVE-2026-34161?
CVE-2026-34161 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-34161?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34161, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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