CVE-2025-7786Public exploitNetwork attack vector

Stored script execution via unencoded reply content

Published Jul 18, 2025 · Updated Jul 18, 2025

Stored XSS in SIRSOFT GNUBOARD6 6.0.0 through 6.0.10 allows remote authenticated users to execute JavaScript in visitors' browsers. The post-reply save handler accepts a closing textarea tag and event-bearing image markup without sanitization, and the QA post view renders the stored reply without output encoding. Exploitation requires a registered user to save a crafted reply; JavaScript then runs when another user opens the affected post, exposing browser-session data and page content.

CVSS severity3.5
Low
EPSS probability0.24%
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 SIRSOFT GNUBOARD6 6.0.0 through 6.0.10 allows remote authenticated users to execute JavaScript in visitors' browsers. The post-reply save handler accepts a closing textarea tag and event-bearing image markup without sanitization, and the QA post view renders the stored reply without output encoding. Exploitation requires a registered user to save a crafted reply; JavaScript then runs when another user opens the affected post, exposing browser-session data and page content.

The record

CVE
CVE-2025-7786
Published
Jul 18, 2025
Updated
Jul 18, 2025
Vendor
GNUBOARD
Product
GNUBOARD6
Classifications
CWE-94, CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.0.0
  2. Affected versionversion=6.0.1
  3. Affected versionversion=6.0.10
  4. Affected versionversion=6.0.2
  5. Affected versionversion=6.0.3
  6. Affected versionversion=6.0.4
  7. Affected versionversion=6.0.5
  8. Affected versionversion=6.0.6
  9. Affected versionversion=6.0.7
  10. Affected versionversion=6.0.8
  11. Affected versionversion=6.0.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GNUBOARD · GNUBOARD6version=6.0.0; version=6.0.1; version=6.0.10; version=6.0.2; version=6.0.3; version=6.0.4; version=6.0.5; version=6.0.6; version=6.0.7; version=6.0.8; version=6.0.9

Published CVSS scores

3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

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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