CVE-2026-32859Network attack vector

Stored XSS via inline active-content artifacts

Published Mar 27, 2026 · Updated Mar 27, 2026

Stored XSS in ByteDance DeerFlow before commit 5dbb362 allows remote authenticated users to execute scripts through crafted artifacts. The Gateway artifact endpoint serves attacker-supplied HTML, XHTML, or SVG as browser-renderable content instead of forcing a download. A user must view the stored artifact; its active content then runs in the DeerFlow origin and can access that user's browser session or credentials.

CVSS severity5.1
Medium
EPSS probability0.20%
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 ByteDance DeerFlow before commit 5dbb362 allows remote authenticated users to execute scripts through crafted artifacts. The Gateway artifact endpoint serves attacker-supplied HTML, XHTML, or SVG as browser-renderable content instead of forcing a download. A user must view the stored artifact; its active content then runs in the DeerFlow origin and can access that user's browser session or credentials.

The record

CVE
CVE-2026-32859
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
ByteDance
Product
DeerFlow
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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?

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  1. Affected versionversion=0 <5dbb3623b2f0e490c8bb3cd81b1e3b1b12eae1a6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ByteDance · DeerFlowversion=0 <5dbb3623b2f0e490c8bb3cd81b1e3b1b12eae1a6

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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