CVE-2020-29133: jsp/upload.jsp in Coremail XT 5.0 allows XSS via an uploaded personal signature, as demonstrated by a .jpg.htm

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-29133 is a medium-severity flaw (CVSS 6.1) affecting coremail xt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

jsp/upload.jsp in Coremail XT 5.0 allows XSS via an uploaded personal signature, as demonstrated by a .jpg.html filename in the signImgFile parameter.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-11-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: coremail xt project

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

Am I affected?

Timeline

2020-11-27 01:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

coremail xt project coremail xt DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy coremail-xt || rpm -q coremail-xt || coremail-xt --version

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison coremail-xt sudo apt install coremail-xt=<VERSION_BEFORE_5.0> sudo apt-mark hold coremail-xt

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

dnf --showduplicates list coremail-xt sudo dnf downgrade coremail-xt-<VERSION_BEFORE_5.0> sudo dnf versionlock add coremail-xt

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-2020-29133?

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

Is CVE-2020-29133 being exploited?

CVE-2020-29133 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-2020-29133 affect?

CVE-2020-29133 affects coremail xt. Severity is medium (CVSS 6.1). jsp/upload.jsp in Coremail XT 5.0 allows XSS via an uploaded personal signature, as demonstrated by a .jpg.html filename in the signImgFile parameter.

How urgent is CVE-2020-29133?

Priority 38/100. No elevated risk signals yet.

Related CVEs

CVE-2018-9330 MEDIUM 5.4 DOWNGRADE register.jsp in Coremail XT3.0 allows stored XSS, as demonstrated by the third form field to a URI under regis
CVE-2018-14503 MEDIUM 6.1 DOWNGRADE Cross-site scripting (XSS) vulnerability in intervalCheck.jsp in Coremail XT 3.0 allows remote attackers to in
CVE-2015-6942 MEDIUM 6.1 DOWNGRADE Cross-site scripting (XSS) vulnerability in Coremail XT3.0 allows remote attackers to inject arbitrary web scr

References

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