CVE-2024-34699Network attack vector

Stored XSS via markdown-rendered team names

Published May 13, 2024 · Updated Aug 2, 2024

Stored XSS in GZTimeWalker GZCTF before 0.20.1 allows remote attackers to execute scripts in other users' browsers via team names. GameNoticePanel passes flag-submission notices containing attacker-controlled team names to InlineMarkdownRender, which interprets the names as markup instead of plain text. A crafted team name must reach another user's flag-submission notice; viewing that notice executes the injected browser content in the victim's session.

CVSS severity7.5
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in GZTimeWalker GZCTF before 0.20.1 allows remote attackers to execute scripts in other users' browsers via team names. GameNoticePanel passes flag-submission notices containing attacker-controlled team names to InlineMarkdownRender, which interprets the names as markup instead of plain text. A crafted team name must reach another user's flag-submission notice; viewing that notice executes the injected browser content in the victim's session.

The record

CVE
CVE-2024-34699
Published
May 13, 2024
Updated
Aug 2, 2024
Vendor
GZTimeWalker
Product
GZCTF
Classifications
CWE-80, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GZTimeWalker · GZCTFversion=< 0.20.1

Published CVSS scores

7.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5GitHub CNA recordCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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