GZ::CTF allows unprivileged user can perform XSS attacks by constructing malicious team names.

published 2024-05-13 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-34995

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 46%
public exploits: 0; none known

GZ::CTF is a capture the flag platform. Prior to 0.20.1, unprivileged user can perform cross-site scripting attacks on other users by constructing malicious team names. This problem has been fixed in `v0.20.1`.

Patch / fix

links 1

github.com/GZTimeWalker/GZCTF@31e775b commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-05-13)

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

GZTimeWalker GZCTF

Classification

Weakness

CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

CVE List CVE-2024-34699
NVD CVE-2024-34699

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