CVE-2022-0962Network attack vector

Stored XSS via accepted .webma uploads

Published Mar 14, 2022 · Updated Aug 2, 2024

Stored cross-site scripting in ShowDoc before 2.10.4 allows remote authenticated users to run script in another user's browser via a .webma upload. The published patch removes active-content extensions from AttachmentModel::isAllowedFilename, but it does not show .webma or disclose how that suffix passes the check. Exploitation requires upload privileges and a viewer who opens the stored attachment; the grounded impact is script execution in that viewer's browser.

CVSS severity9.0
Critical
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in ShowDoc before 2.10.4 allows remote authenticated users to run script in another user's browser via a .webma upload. The published patch removes active-content extensions from AttachmentModel::isAllowedFilename, but it does not show .webma or disclose how that suffix passes the check. Exploitation requires upload privileges and a viewer who opens the stored attachment; the grounded impact is script execution in that viewer's browser.

The record

CVE
CVE-2022-0962
Published
Mar 14, 2022
Updated
Aug 2, 2024
Vendor
ShowDoc
Product
ShowDoc
Classifications
CWE-79, CWE-434, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 14, 2022CVE 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=unspecified <2.10.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ShowDoc · ShowDocversion=unspecified <2.10.4

Published CVSS scores

9.0huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-434Unrestricted Upload of File with Dangerous Type
T1189Drive-by Compromise

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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