A vulnerability has been identified in armeria versions 0.84.0 through 1.42.0, where any-origin CORS policies do not enforce configured…
- Exploited
- No known exploitation
- Fix
- Fixed in 1.43.0
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 1.43.0.
- Last modified
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.32% · 25th percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 12/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The Armeria Java framework, in versions 0.84.0 through 1.42.0, does not enforce configured path restrictions on any-origin CORS policies. An attacker can lure a victim who is logged in to a malicious website, which can remotely, without logging in, read sensitive responses from the excluded paths when credentials are enabled and the victim's browser sends them.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
A vulnerability has been identified in armeria versions 0.84.0 through 1.42.0, where any-origin CORS policies do not enforce configured path restrictions, allowing an attacker-controlled website visited by an authenticated victim to read sensitive responses from excluded paths when credentials are enabled and the victim's browser sends authentication credentials.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure7/25Reachable over the network without a login · Unknown: No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity5.3/10CVSS 5.3
- No patch0/5No signal
What would change the score
- Would score about 67 if added to CISA KEV
- Would score about 62 if CISA's SSVC rates exploitation active
- Would score about 27 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 1.43.0.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- LY Corporation Armeria
From 0.84.0 · fixed in 1.43.0
Evidence 2
- Advisory
- Link
Corrections
None so far.
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Questions about CVE-2026-121821
Is CVE-2026-121821 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-121821?
Armeria: from 0.84.0 before 1.43.0.Source: cve.now feed data
How do I fix CVE-2026-121821?
Upgrade to a fixed version: 1.43.0.Source: cve.now feed data