Stored Cross-Site Scripting Vulnerability in PandaWiki by Chaitin
CVE-2026-120428

5.1MEDIUM

Key Information:

Vendor

Chaitin

Status
Pandawiki
Vendor
CVE Published:
2 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-120428?

PandaWiki versions 3.65.0 through 3.87.5 are susceptible to a stored cross-site scripting vulnerability. This issue allows unauthenticated attackers to exploit the /share/v1/common/file/upload endpoint, enabling them to upload HTML files masquerading as images. By misleading administrators into accessing a crafted URL, attackers can bypass the nginx attachment header, leading to the inline rendering of the malicious HTML. This exploit facilitates the theft of the panda_wiki_token JWT, potentially resulting in session takeover and unauthorized access to user accounts.

Affected Version(s)

PandaWiki 3.65.0 <= 3.87.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-120428 - Proof of Concept

References

https://github.com/chaitin/PandaWiki/issues/1845
issue-tracking
https://vul.yulun.ac.cn/20261101/pandawiki/
exploit
https://github.com/chaitin/PandaWiki/blob/v3.87.5/web/adm...
technical-description

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Wu Yulun
.