OpenCATS through 0.9.5-3 has multiple Cross-site Scripting (XSS) issues.

published 2021-01-18 5y ago modified 2026-06-17 4mo ago also EUVD-2021-12195

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits: 0; none known

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Exploit prediction

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

snoopysecurity.github.io https://snoopysecurity.github.io/web-application-security/2021/01/16/09_opencats_php_object_injection.html referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/snoopysecurity/snoopysecurity.github.io/blob/master/web-application-security/2021/01/16/09_opencats_php_object_injection.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

snoopysecurity.github.io /web-application-security/2021/01/16/09_opencats_php_object_injection.html
exploit, third-party-advisory
github.com /snoopysecurity/snoopysecurity.github.io/blob/master/web-application-security/2021/01/16/09_opencats_php_objec
exploit, third-party-advisory
opencats.org /news/
product, vendor-advisory

Sources

CVE List CVE-2021-25295
NVD CVE-2021-25295

Fencer Intel 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.