WP RSS Aggregator < 4.19.3 - Subscriber+ Stored Cross-Site Scripting

published 2021-12-27 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11900

cvss: 5.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits: 0; none known

The WP RSS Aggregator WordPress plugin before 4.19.3 does not sanitise and escape data before outputting it in the System Info admin dashboard, which could lead to a Stored XSS issue due to the wprss_dismiss_addon_notice AJAX action missing authorisation and CSRF checks, allowing any authenticated users, such as subscriber to call it and set a malicious payload in the addon parameter.

Patch / fix

fixed in 1

wprssaggregator wp_rss_aggregator 4.19.3

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

wpscan.com https://wpscan.com/vulnerability/0742483b-6314-451b-a63a-536fd1e14845 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N

Affected products

Unknown WP RSS Aggregator – News Feeds, Autoblogging, Youtube Video Feeds and More

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-352 Cross-Site Request Forgery
CWE-862 Missing Authorization

Technology feeds

WordPress rss critical rss

References

wpscan.com /vulnerability/0742483b-6314-451b-a63a-536fd1e14845
exploit, third-party-advisory

Sources

CVE List CVE-2021-24988
NVD CVE-2021-24988

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary