What is CVE-2021-26812?

CVE-2021-26812 is a medium-severity vulnerability in Jitsi Meet, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-14.

How severe is CVE-2021-26812?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-26812 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Jitsi Meet

CVE-2021-26812

Cross Site Scripting (XSS) in the Jitsi Meet 2.7 through 2.8.3 plugin for Moodle via the "sessionpriv.php" module. This allows attackers to craft a malicious URL, which when clicked on by users, can inject javascript code to be run by the application.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.972 (99.9th percentile), scored 2026-10-29.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.972 · newest: 0.972 · change: 0.000

Affected products

Jitsi Meet

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/udima-university/moodle-mod_jitsi/issues/67 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-26812?: CVE-2021-26812 is a medium-severity vulnerability in Jitsi Meet, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-14.
How severe is CVE-2021-26812?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-26812 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.