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NVD / CVE Program· CNA mitre

CVE-2020-15803: Zabbix before 3.0.32rc1, 4.x before 4.0.22rc1, 4.1.x through 4.4.x before 4.4.10rc1, and 5.x before 5.0.2rc1 allows stored XSS in the URL…

MediumCVSS 6.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 32.3% (FIRST EPSS); higher than 98.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: zabbix (Debian:10) 1:4.0.4+dfsg-1+deb10u1; zabbix (Debian:12) 1:5.0.2+dfsg-1; zabbix (Debian:9) 1:3.0.7+dfsg-3+deb9u1, 1:3.0.32+dfsg-0+deb9u1.

Low priority for now. Upgrade to zabbix (Debian:10) 1:4.0.4+dfsg-1+deb10u1; zabbix (Debian:12) 1:5.0.2+dfsg-1; zabbix (Debian:9) 1:3.0.7+dfsg-3+deb9u1, 1:3.0.32+dfsg-0+deb9u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Zabbix before 3.0.32rc1, 4.x before 4.0.22rc1, 4.1.x through 4.4.x before 4.4.10rc1, and 5.x before 5.0.2rc1 allows stored XSS in the URL Widget.

Published
Jul 16, 2020
Updated
Jun 16, 2026
EPSS
32.3% · 98th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
10 / 30 · 32.3%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-15803

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
zabbixzabbix
fedoraprojectfedora
debiandebian linux
opensusebackports
opensuseleap

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux9.0
  • fedoraproject fedora31
  • fedoraproject fedora32
  • opensuse backportssle-15
  • opensuse leap15.1
  • opensuse leap15.2
  • zabbix zabbixup to 3.0.31 inclusive
  • zabbix zabbix4.0.0 and later · up to 4.0.21 inclusive
  • zabbix zabbix4.4 and later · up to 4.4.9 inclusive
  • zabbix zabbix5.0.0 and later · up to 5.0.1 inclusive
  • zabbix zabbix3.0.32
  • zabbix zabbix4.0.22
  • zabbix zabbix4.4.10
  • zabbix zabbix5.0.2

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10zabbixbefore 1:4.0.4+dfsg-1+deb10u11:4.0.4+dfsg-1+deb10u1
Debian:12zabbixbefore 1:5.0.2+dfsg-11:5.0.2+dfsg-1
Debian:9zabbixbefore 1:3.0.7+dfsg-3+deb9u11:3.0.7+dfsg-3+deb9u1
Debian:9zabbixbefore 1:3.0.32+dfsg-0+deb9u11:3.0.32+dfsg-0+deb9u1
openSUSE:Leap 15.1zabbixbefore 3.0.31-bp152.2.3.13.0.31-bp152.2.3.1
openSUSE:Leap 15.3zabbixbefore 4.0.37-lp153.2.3.14.0.37-lp153.2.3.1
SUSE:Linux Enterprise Server 12 SP5zabbixbefore 4.0.12-4.7.14.0.12-4.7.1
SUSE:Package Hub 15 SP1zabbixbefore 3.0.31-bp152.2.3.13.0.31-bp152.2.3.1

Same product

zabbix: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-23131Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAMLKEV
    98Now
  • CVE-2022-23134Possible view of the setup pages by unauthenticated users if config file already existsKEV
    80Now
  • CVE-2016-10134SQL injection vulnerability in Zabbix before 2.2.14 and 3.0 before 3.0.4 allows remote attackers to execute arbitrary SQL commands via the…
    64This week

Published before and after this one in the same product

  • ← EarlierCVE-2013-3628Feb 7, 2020 · Zabbix 2.0.9 has an Arbitrary Command Execution Vulnerability
    55Plan
  • ← EarlierCVE-2013-3738Feb 17, 2020 · A File Inclusion vulnerability exists in Zabbix 2.0.6 due to inadequate sanitization of request strings in CGI scripts, which could let a…
    40Plan
  • Later →CVE-2020-11800Oct 7, 2020 · Zabbix Server 2.2.x and 3.0.x before 3.0.31, and 3.2 allows remote attackers to execute arbitrary code.
    42Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:zabbix1:5.0.2+dfsg-1 · Debian:12Package registry (OSV)
opensuse:zabbix3.0.31-bp152.2.3.1 · openSUSE:Leap 15.1Package registry (OSV)
suse:zabbix3.0.31-bp152.2.3.1 · SUSE:Package Hub 15 SP1Package registry (OSV)
suse:zabbix4.0.12-4.7.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records