CVE-2026-65645: Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6

Routine

MEDIUM 4.3UPGRADE

CVE-2026-65645 is a medium-severity flaw (CVSS 4.3) affecting rocket.chat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6. 8.3.8, 8.2.8, 8.1.8, and 7.10.15, the Meteor DDP methods getThreadsList and getThreadMessages accept rid / tmid as raw, untyped parameters with no schema validation. A MongoDB operator object (e.g. {"$gt": "4"}) can be substituted for a string room-id or message-id. The authorization check resolves to a room the attacker already has access to, while the downstream data query fans o

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-08-21
Last modified	2026-10-26

Publisher (CNA): HackerOne · Vendor: rocket.chat

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

Am I affected?

Timeline

2026-08-21 04:18 UTCPublished CVE record published
2026-10-26 10:10 UTCUpdated Record last modified

rocket.chat rocket.chat UPGRADE

Affected: < 7.10.15 · >= 8.1.0 and < 8.1.8 · >= 8.2.0 and < 8.2.8 · >= 8.3.0 and < 8.3.8 · >= 8.4.0 and < 8.4.6 · >= 8.5.0 and < 8.5.3 · >= 8.6.0 and < 8.6.2 · 8.7.0

Fixed in: 7.10.15, 8.1.8, 8.2.8, 8.3.8, 8.4.6, 8.5.3, 8.6.2

Safe to downgrade to: a release before 8.1.0

1. Check installed version

apt-cache policy rocket.chat || rpm -q rocket.chat || rocket.chat --version

2. UPGRADE to 7.10.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rocket.chat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rocket.chat

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 8.1.0 (Debian / Ubuntu)

apt-cache madison rocket.chat sudo apt install rocket.chat=<VERSION_BEFORE_8.1.0> sudo apt-mark hold rocket.chat

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

dnf --showduplicates list rocket.chat sudo dnf downgrade rocket.chat-<VERSION_BEFORE_8.1.0> sudo dnf versionlock add rocket.chat

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-2026-65645?

rocket.chat: upgrade to 7.10.15, 8.1.8, 8.2.8, 8.3.8, 8.4.6, 8.5.3, 8.6.2. Exact commands for each OS are on this page.

Is CVE-2026-65645 being exploited?

CVE-2026-65645 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-2026-65645 affect?

CVE-2026-65645 affects rocket.chat. Severity is medium (CVSS 4.3). Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6. 8.3.8, 8.2.8, 8.1.8, and 7.10.15, the Meteor DDP methods getThreadsList and getThreadMessages accept rid / tmid as raw, untyped parameters with no schema validation. A MongoD

How urgent is CVE-2026-65645?

Priority 22/100. No elevated risk signals yet.

Software pages

MongoDB vulnerabilities · Rocket.Chat vulnerabilities

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References

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