XSS in Light Messages Project
CVE-2021-24535
The Light Messages WordPress plugin through 1.0 is lacking CSRF check when updating it's settings, and is not sanitising its Message Content in them (even with the unfiltered_html disallowed). As a result, an attacker could make a logged in admin update the settings to arbitrary values, and set a Cross-Site Scripting payload in the Message Content. Depending on the options set, the XSS payload can be triggered either in the backend only (in the plugin's settings), or both frontend and backend.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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: 0.004 (33.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Light Messages Project
- Light Messages — versions 1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- wpscan.com/vulnerability/351de889-9c0a-4637-bd06-0e1fe1d7e89f (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-24535?
- CVE-2021-24535 is a medium-severity vulnerability in Light Messages Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-08-16.
- How severe is CVE-2021-24535?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-24535 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.