CVE-2011-5026

medium

Published 2011-12-29 · Modified 2026-04-29

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

5.3

Description

Cross-site scripting (XSS) vulnerability in the addPost function in data/functions.php in Winn GuestBook before 2.4.8d allows remote attackers to inject arbitrary web script or HTML via the name parameter to index.php. NOTE: some of these details are obtained from third party information.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-18290 webapps php verified

G13 · 2011-12-29

Winn Guestbook 2.4.8c - Persistent Cross-Site Scripting

Source code queued for fetch — refresh in a moment.

Application impact

Vendor	Product	Versions
winn	winn_guestbook	`{"endIncluding":"2.4.8c"}`
winn	winn_guestbook	`2.4.1`
winn	winn_guestbook	`2.4.2`
winn	winn_guestbook	`2.4.3`
winn	winn_guestbook	`2.4.4`
winn	winn_guestbook	`2.4.5`
winn	winn_guestbook	`2.4.6`
winn	winn_guestbook	`2.4.7`
winn	winn_guestbook	`2.4.8b`

References

CWEs

CWE-79

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.