NVD / CVE Program· CNA Fluid Attacks

CVE-2026-11944: openSIS Classic 9.3 - Authenticated path traversal in SentMail attachment download

Noroxi assessment

Priority: Monitor (action score 21/100)

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: 0.48% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

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

openSIS Classic 9.3 contains an authenticated path traversal vulnerability in the legacy messaging sent-mail attachment download functionality that allows an authenticated attacker to read arbitrary files on the server via crafted path traversal sequences.

MediumCVSS 5.3 · v4.0—No exploit No fix recorded

Path traversal

Published: Jul 14, 2026
Updated: Oct 24, 2026
EPSS: 0.4% · 41th percentile
CWE: CWE-22

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CISA SSVC decision

Exploitation: proof of concept
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Fluid Attacks: 5.3; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

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

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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.

Vendor	Product	CPE
os4ed	opensis	cpe:2.3:a:os4ed:opensis
apple	macos	cpe:2.3:o:apple:macos
linux	linux kernel	cpe:2.3:o:linux:linux_kernel
microsoft	windows	cpe:2.3:o:microsoft:windows

Affected versions

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

os4ed opensis9.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Fluid Attacks). Independent of NVD's CPE analysis and usually ahead of it.

OS4ED openSIS-Classic
- 9.3affected

Same product

os4ed: all records

Other highest-scoring records for the same primary product.

CVE-2020-13383openSIS through 7.4 allows Directory Traversal.
60This week
CVE-2020-13382openSIS through 7.4 has Incorrect Access Control.
60This week
CVE-2020-13381openSIS through 7.4 allows SQL Injection.
60This week

Published before and after this one in the same product

← EarlierCVE-2021-41691Jun 24, 2025 · A SQL injection vulnerability exists in OS4Ed Open Source Information System Community v8.0 via the "student_id" and "TRANSFER{SCHOOL]" para
40Plan
← EarlierCVE-2025-26186Jul 15, 2025 · SQL Injection vulnerability in openSIS v.9.1 allows a remote attacker to execute arbitrary code via the id parameter in Ajax.php
32Monitor
← EarlierCVE-2025-65594Dec 9, 2025 · OpenSIS 9.2 and below is vulnerable to Incorrect Access Control in Student.php, which allows an authenticated low-privilege user to perform
32Monitor

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

Daniel Celisfinder

Variant candidates

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

CVE-2025-22926467 days apartAn issue in OS4ED openSIS v8.0 through v9.1 allows attackers to execute a directory traversal by sending a crafted POST request to /Modules.
39Monitor
CVE-2025-22927467 days apartAn issue in OS4ED openSIS v8.0 through v9.1 allows attackers to execute a directory traversal by sending a crafted POST request to /Modules.
36Monitor
CVE-2025-22923468 days apartAn issue in OS4ED openSIS v8.0 through v9.1 allows attackers to execute a directory traversal and delete files by sending a crafted POST req
35Monitor

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.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: X

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

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

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

github.com/OS4ED/openSIS-Classic

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

All records