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Response snapshot Oct 27, 2026, 16:01 UTC

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VulnerabilityGHSA-hhww-mrg2-969h

LiteLLM vulnerable to reflected XSS in /sso/debug/callback

The `/sso/debug/callback` endpoint reflected identity-provider-controlled fields into an inline ``. An IdP-returned string field containing ` ` (for example a user-editable display name) closed the script block and executed attacker JavaScript in the proxy's origin.

At a glance

Exploited
Not known
Severity
Not scored yet
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: litellm: 1.85.0. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-hhww-mrg2-969h (opens a new tab)

What happened

### Summary

The `/sso/debug/callback` endpoint reflected identity-provider-controlled fields into an inline ``. An IdP-returned string field containing ` ` (for example a user-editable display name) closed the script block and executed attacker JavaScript in the proxy's origin.

### Impact

Reflected XSS on the LiteLLM proxy origin. The route required no authentication, so an attacker with an account on the configured IdP whose claims pass such strings through verbatim could complete the SSO flow themselves and deliver the resulting callback URL to a logged-in proxy admin. Scripts executing in the proxy origin can read the dashboard session cookie and act with the victim's privileges, up to full admin account takeover.

Continue reading

Affected package ranges reported by GitHub: litellm: >= 1.65.5, < 1.85.0

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-hhww-mrg2-969h (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-hhww-mrg2-969h, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 27). LiteLLM vulnerable to reflected XSS in /sso/debug/callback. https://kevwire.com/record/GHSA-hhww-mrg2-969h

MLA

"LiteLLM vulnerable to reflected XSS in /sso/debug/callback." KEVWire, 27 Oct. 2026, kevwire.com/record/GHSA-hhww-mrg2-969h.

Chicago

KEVWire. "LiteLLM vulnerable to reflected XSS in /sso/debug/callback." Last modified October 27, 2026. https://kevwire.com/record/GHSA-hhww-mrg2-969h.

Evidence summary (plain text)

LiteLLM vulnerable to reflected XSS in /sso/debug/callback (Oct 27, 2026).
The `/sso/debug/callback` endpoint reflected identity-provider-controlled fields into an inline ``. An IdP-returned string field containing ` ` (for example a user-editable display name) closed the script block and executed attacker JavaScript in the proxy's origin.

Reflected XSS on the LiteLLM proxy origin. The route required no authentication, so an attacker with an account on the configured IdP whose claims pass such strings through verbatim could complete the SSO flow themselves and deliver the resulting callback URL to a logged-in proxy admin. Scripts executing in the proxy origin can read the dashboard session cookie and act with the victim's privileges, up to full admin account takeover.
Sources:
GitHub-reviewed advisory GHSA-hhww-mrg2-969h: https://github.com/advisories/GHSA-hhww-mrg2-969h
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: GHSA-hhww-mrg2-969h.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 16:00 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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