CVE-2020-35249: Cross Site Scripting (XSS) vulnerability in ElkarBackup 1.3.3, allows attackers to execute arbitrary code via

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MEDIUM 6.1DOWNGRADE

CVE-2020-35249 is a medium-severity flaw (CVSS 6.1) affecting elkarbackup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability in ElkarBackup 1.3.3, allows attackers to execute arbitrary code via the name parameter to the add client feature.

Why this priority

Public exploit reference

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	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: elkarbackup

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

Am I affected?

Timeline

2021-11-02 11:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

elkarbackup elkarbackup DOWNGRADE

Affected: 1.3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.3 (Debian / Ubuntu)

apt-cache madison elkarbackup sudo apt install elkarbackup=<VERSION_BEFORE_1.3.3> sudo apt-mark hold elkarbackup

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

dnf --showduplicates list elkarbackup sudo dnf downgrade elkarbackup-<VERSION_BEFORE_1.3.3> sudo dnf versionlock add elkarbackup

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-2020-35249?

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

Is CVE-2020-35249 being exploited?

CVE-2020-35249 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-2020-35249 affect?

CVE-2020-35249 affects elkarbackup. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability in ElkarBackup 1.3.3, allows attackers to execute arbitrary code via the name parameter to the add client feature.

How urgent is CVE-2020-35249?

Priority 43/100. Public exploit reference

References

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