CVE-2026-32753Public exploitNetwork attack vector

Stored XSS via SVG sanitizer fallback bypass

Published Mar 19, 2026 · Updated Mar 19, 2026

Stored XSS in FreeScout before 1.8.209 allows remote authenticated users to execute JavaScript when another user opens a crafted attachment URL. The attachment classifier accepts an allowed .png extension with image/svg+xml, while sanitizeUploadedFileData falls back to a script-tag-only regex when SVG parsing fails. A signed-in attacker must upload a parser-differential SVG and induce another user to open its URL, after which the script can act with that victim's application privileges.

CVSS severity8.5
High
EPSS probability0.21%
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 FreeScout before 1.8.209 allows remote authenticated users to execute JavaScript when another user opens a crafted attachment URL. The attachment classifier accepts an allowed .png extension with image/svg+xml, while sanitizeUploadedFileData falls back to a script-tag-only regex when SVG parsing fails. A signed-in attacker must upload a parser-differential SVG and induce another user to open its URL, after which the script can act with that victim's application privileges.

The record

CVE
CVE-2026-32753
Published
Mar 19, 2026
Updated
Mar 19, 2026
Vendor
FreeScout
Product
FreeScout
Classifications
CWE-80, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2026Record 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=< 1.8.209

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FreeScout · FreeScoutversion=< 1.8.209

Published CVSS scores

8.5GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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 exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
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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