CVE-2017-5858: An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker t

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MEDIUM 5.9REMOTEDOWNGRADE

CVE-2017-5858 is a medium-severity flaw (CVSS 5.9) affecting converse.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. This allows for various kinds of social engineering attacks. This CVE is for Converse.js (0.8.0 - 1.0.6, 2.0.0 - 2.0.4).

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-20, CWE-346
Published	2017-02-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: conversejs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-02-09 20:59 UTCPublished CVE record published
2026-06-17 01:21 UTCUpdated Record last modified

conversejs converse.js DOWNGRADE

Affected: 0.8.0 · 0.8.1 · 0.8.2 · 0.8.3 · 0.8.4 · 0.8.5 · 0.8.6 · 0.9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.8.0

1. Check installed version

apt-cache policy converse.js || rpm -q converse.js || converse.js --version

2. No fixed release: DOWNGRADE to a release before 0.8.0 (Debian / Ubuntu)

apt-cache madison converse.js sudo apt install converse.js=<VERSION_BEFORE_0.8.0> sudo apt-mark hold converse.js

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list converse.js sudo dnf downgrade converse.js-<VERSION_BEFORE_0.8.0> sudo dnf versionlock add converse.js

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-2017-5858?

converse.js: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-5858 being exploited?

CVE-2017-5858 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-2017-5858 affect?

CVE-2017-5858 affects converse.js. Severity is medium (CVSS 5.9). An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. This allows for various kinds of social engin

How urgent is CVE-2017-5858?

Priority 46/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-6591 MEDIUM 5.3 UPGRADE Converse.js and Inverse.js through 3.3 allow remote attackers to obtain sensitive information because it is to

References

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