CVE-2026-35565: Stored Cross-Site Scripting (XSS) via Unsanitized Topology Metadata in Apache Storm UI Versions Affected: be

Routine

MEDIUM 5.4WATCHLISTUPGRADE

CVE-2026-35565 is a medium-severity flaw (CVSS 5.4) affecting storm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stored Cross-Site Scripting (XSS) via Unsanitized Topology Metadata in Apache Storm UI Versions Affected: before 2.8.6 Description: The Storm UI visualization component interpolates topology metadata including component IDs, stream names, and grouping values directly into HTML via innerHTML in parseNode() and parseEdge() without sanitization at any layer. An authenticated user with topology submission rights could craft a topology containing

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-13
Last modified	2026-10-26

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-13 10:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

apache storm UPGRADE

Affected: >= 2.0.0 and < 2.8.6

Fixed in: 2.8.6

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy storm || rpm -q storm || storm --version

2. UPGRADE to 2.8.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade storm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade storm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison storm sudo apt install storm=<VERSION_BEFORE_2.0.0> sudo apt-mark hold storm

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list storm sudo dnf downgrade storm-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add storm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35565?

storm: upgrade to 2.8.6. Exact commands for each OS are on this page.

Is CVE-2026-35565 being exploited?

CVE-2026-35565 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35565 affect?

CVE-2026-35565 affects storm. Severity is medium (CVSS 5.4). Stored Cross-Site Scripting (XSS) via Unsanitized Topology Metadata in Apache Storm UI Versions Affected: before 2.8.6 Description: The Storm UI visualization component interpolates topology metadata including component IDs, stream name

How urgent is CVE-2026-35565?

Priority 34/100. On your watchlist

Related CVEs

CVE-2026-35337 HIGH 8.8 UPGRADE Deserialization of Untrusted Data vulnerability in Apache Storm. Versions Affected: before 2.8.6. Descripti
CVE-2026-41081 MEDIUM 6.5 UPGRADE Improper Handling of TLS Client Authentication Failure Leading to Anonymous Principal Assignment in Apache Sto

References

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