---
id: "CVE-2026-118987"
kind: "vulnerability"
aliases: ["CVE-2026-118987"]
title: "CallBackery Perl: old session cookies accepted indefinitely via X-Session-Cookie header"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["callbackery", "package", "perl", "self-hosted"]
not_affected_if: ["version-0.62.0-or-later"]
published_at: "2026-10-30T14:16:41+00:00"
first_seen_at: "2026-10-30T14:30:53+00:00"
updated_at: "2026-10-30T14:33:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118987", "first_seen_at": "2026-10-30T14:30:53+00:00"}]
---

# CallBackery Perl: old session cookies accepted indefinitely via X-Session-Cookie header

CallBackery for Perl ignores the 300-second age limit on session cookies sent in the X-Session-Cookie header, while the xsc query parameter is still checked. A session cookie that leaks through logs, a Referer header or browser history can authenticate as its user indefinitely.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed CallBackery version; affected versions are those before `0.62.0`.
- Look for use of the `X-Session-Cookie` header in front-end proxy or application logs.

## Fix

- Move to CallBackery `0.62.0` or later.

## Timeline

- 2026-10-30T14:30:53+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118987

## From the sources

CallBackery versions before 0.62.0 for Perl accept session cookies of any age sent in the X-Session-Cookie header.

cookieConf() rejects a cookie older than 300 seconds only when it arrives in the xsc query parameter. The same cookie sent in the X-Session-Cookie header is accepted however old it is.

A session cookie that leaks through a log, a Referer header or browser history authenticates as its user indefinitely.

---

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