THREATPORT/VULNERABILITY/CVE-2026-22218
MEDIUM SEVERITY

CVE-2026-22218

Chainlit vulnerability

CVSS
6.5
EPSS
8.8%
EPSS pct
95th
Exploited
No known
Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/<chainlitKey>, allowing disclosure of any file readable by the Chainlit service.
Affected vendor
Chainlit
Affected product
Chainlit
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness type (CWE)
Published
2026-01-20

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 8.8% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2026-22218

  • Confirm whether Chainlit Chainlit is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-22218.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-22218

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-22218 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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